/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/id_b3_o2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 07:03:18,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:03:18,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:03:18,289 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 07:03:18,290 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 07:03:18,292 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 07:03:18,293 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 07:03:18,296 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 07:03:18,298 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 07:03:18,299 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 07:03:18,301 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 07:03:18,303 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 07:03:18,303 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:03:18,305 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:03:18,306 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:03:18,308 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:03:18,309 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:03:18,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:03:18,329 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:03:18,335 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:03:18,337 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:03:18,340 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:03:18,344 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:03:18,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:03:18,353 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:03:18,363 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-22 07:03:18,366 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-22 07:03:18,367 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-22 07:03:18,369 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-22 07:03:18,370 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-22 07:03:18,371 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-22 07:03:18,372 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-22 07:03:18,372 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-22 07:03:18,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:03:18,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:03:18,375 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:03:18,380 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:03:18,434 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:03:18,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:03:18,438 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:03:18,438 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:03:18,439 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:03:18,439 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:03:18,439 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:03:18,439 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:03:18,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:03:18,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:03:18,441 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:03:18,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:03:18,441 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:03:18,442 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:03:18,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:03:18,442 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:03:18,442 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:03:18,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:18,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:03:18,443 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:03:18,443 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:03:18,444 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:03:18,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:03:18,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:03:18,444 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:03:18,445 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:03:18,878 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:03:18,913 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:03:18,916 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:03:18,918 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:03:18,918 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:03:18,919 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_b3_o2-2.c [2020-12-22 07:03:19,028 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d3635f0c/91e8aa50d8154a4d873f13040616c745/FLAG6cb7dd447 [2020-12-22 07:03:19,606 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:03:19,607 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_b3_o2-2.c [2020-12-22 07:03:19,615 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d3635f0c/91e8aa50d8154a4d873f13040616c745/FLAG6cb7dd447 [2020-12-22 07:03:19,966 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d3635f0c/91e8aa50d8154a4d873f13040616c745 [2020-12-22 07:03:19,969 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:03:19,972 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:03:19,977 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:19,977 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:03:19,982 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:03:19,983 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:19" (1/1) ... [2020-12-22 07:03:19,985 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bc1da47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:19, skipping insertion in model container [2020-12-22 07:03:19,985 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:19" (1/1) ... [2020-12-22 07:03:19,994 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:03:20,013 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:03:20,229 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_b3_o2-2.c[528,541] [2020-12-22 07:03:20,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:20,244 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:03:20,261 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_b3_o2-2.c[528,541] [2020-12-22 07:03:20,262 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:20,278 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:03:20,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20 WrapperNode [2020-12-22 07:03:20,279 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:20,280 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:20,281 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:03:20,281 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:03:20,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,298 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,315 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:20,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:03:20,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:03:20,316 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:03:20,326 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,326 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,328 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,328 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,331 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,333 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,335 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... [2020-12-22 07:03:20,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:03:20,338 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:03:20,338 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:03:20,338 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:03:20,339 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:20,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:03:20,442 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:03:20,442 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:03:20,442 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-22 07:03:20,442 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-22 07:03:20,442 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:03:20,742 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:03:20,743 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 07:03:20,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:20 BoogieIcfgContainer [2020-12-22 07:03:20,746 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:03:20,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:03:20,750 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:03:20,754 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:03:20,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:03:19" (1/3) ... [2020-12-22 07:03:20,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34b8fadd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:20, skipping insertion in model container [2020-12-22 07:03:20,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:20" (2/3) ... [2020-12-22 07:03:20,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34b8fadd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:20, skipping insertion in model container [2020-12-22 07:03:20,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:20" (3/3) ... [2020-12-22 07:03:20,765 INFO L111 eAbstractionObserver]: Analyzing ICFG id_b3_o2-2.c [2020-12-22 07:03:20,776 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:03:20,782 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:03:20,808 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:03:20,856 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:03:20,856 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:03:20,857 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:03:20,857 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:03:20,857 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:03:20,857 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:03:20,857 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:03:20,884 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:03:20,933 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-12-22 07:03:20,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 07:03:20,950 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:20,950 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:20,951 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:20,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:20,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1972897208, now seen corresponding path program 1 times [2020-12-22 07:03:20,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:20,976 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934945490] [2020-12-22 07:03:20,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:21,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:21,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:21,356 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934945490] [2020-12-22 07:03:21,357 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:21,358 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:21,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805535122] [2020-12-22 07:03:21,374 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:21,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:21,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:21,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:21,418 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-12-22 07:03:21,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:21,518 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-12-22 07:03:21,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:21,520 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 07:03:21,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:21,531 INFO L225 Difference]: With dead ends: 29 [2020-12-22 07:03:21,532 INFO L226 Difference]: Without dead ends: 16 [2020-12-22 07:03:21,536 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:21,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-22 07:03:21,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-22 07:03:21,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-22 07:03:21,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-22 07:03:21,584 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2020-12-22 07:03:21,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:21,585 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-22 07:03:21,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:21,586 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-22 07:03:21,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:21,589 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:21,589 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:21,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:03:21,590 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:21,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:21,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1641441273, now seen corresponding path program 1 times [2020-12-22 07:03:21,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:21,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599704392] [2020-12-22 07:03:21,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:21,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:21,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:21,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,733 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:21,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599704392] [2020-12-22 07:03:21,733 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:21,734 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:21,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752631092] [2020-12-22 07:03:21,735 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:21,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:21,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:21,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:21,737 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-12-22 07:03:21,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:21,753 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-12-22 07:03:21,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:21,754 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-22 07:03:21,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:21,755 INFO L225 Difference]: With dead ends: 28 [2020-12-22 07:03:21,755 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 07:03:21,756 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:21,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 07:03:21,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-12-22 07:03:21,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 07:03:21,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-22 07:03:21,762 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 17 [2020-12-22 07:03:21,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:21,763 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-22 07:03:21,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:21,763 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-22 07:03:21,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:21,764 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:21,764 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:21,764 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:03:21,764 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:21,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:21,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1670070424, now seen corresponding path program 1 times [2020-12-22 07:03:21,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:21,766 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189948294] [2020-12-22 07:03:21,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:21,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:21,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:21,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,881 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:21,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189948294] [2020-12-22 07:03:21,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623610385] [2020-12-22 07:03:21,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:21,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:21,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 07:03:21,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:22,051 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:22,051 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:22,052 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-22 07:03:22,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110893655] [2020-12-22 07:03:22,053 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 07:03:22,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:22,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 07:03:22,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:22,055 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 9 states. [2020-12-22 07:03:22,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:22,134 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-22 07:03:22,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:22,135 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2020-12-22 07:03:22,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:22,138 INFO L225 Difference]: With dead ends: 24 [2020-12-22 07:03:22,138 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 07:03:22,141 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-12-22 07:03:22,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 07:03:22,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-22 07:03:22,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-22 07:03:22,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-22 07:03:22,154 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-12-22 07:03:22,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:22,155 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-22 07:03:22,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 07:03:22,155 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-22 07:03:22,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:22,160 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:22,160 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:22,373 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 07:03:22,374 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:22,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:22,375 INFO L82 PathProgramCache]: Analyzing trace with hash -755943847, now seen corresponding path program 1 times [2020-12-22 07:03:22,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:22,377 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851051864] [2020-12-22 07:03:22,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:22,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:22,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:22,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:22,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:22,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:22,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:22,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:22,487 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-22 07:03:22,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851051864] [2020-12-22 07:03:22,488 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:22,488 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:22,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444852673] [2020-12-22 07:03:22,489 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:22,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:22,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:22,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:22,490 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 5 states. [2020-12-22 07:03:22,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:22,505 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-12-22 07:03:22,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:22,506 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-12-22 07:03:22,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:22,507 INFO L225 Difference]: With dead ends: 26 [2020-12-22 07:03:22,507 INFO L226 Difference]: Without dead ends: 22 [2020-12-22 07:03:22,508 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:22,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-22 07:03:22,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-12-22 07:03:22,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-22 07:03:22,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-22 07:03:22,513 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 24 [2020-12-22 07:03:22,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:22,513 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-22 07:03:22,513 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:22,514 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-22 07:03:22,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:22,515 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:22,515 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:22,515 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 07:03:22,516 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:22,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:22,516 INFO L82 PathProgramCache]: Analyzing trace with hash -727314696, now seen corresponding path program 2 times [2020-12-22 07:03:22,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:22,517 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47058734] [2020-12-22 07:03:22,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:22,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:22,565 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:22,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:22,623 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:22,647 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 07:03:22,648 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 07:03:22,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-22 07:03:22,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 07:03:22 BoogieIcfgContainer [2020-12-22 07:03:22,691 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 07:03:22,691 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 07:03:22,692 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 07:03:22,692 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 07:03:22,692 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:20" (3/4) ... [2020-12-22 07:03:22,695 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 07:03:22,752 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id_b3_o2-2.c-witness.graphml [2020-12-22 07:03:22,752 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 07:03:22,754 INFO L168 Benchmark]: Toolchain (without parser) took 2780.98 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 53.8 MB in the end (delta: 72.9 MB). Peak memory consumption was 72.1 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,755 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory was 123.6 MB in the beginning and 123.5 MB in the end (delta: 84.5 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:22,756 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.4 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,757 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.68 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 116.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,758 INFO L168 Benchmark]: Boogie Preprocessor took 21.17 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,759 INFO L168 Benchmark]: RCFGBuilder took 408.32 ms. Allocated memory is still 151.0 MB. Free memory was 115.0 MB in the beginning and 103.5 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,760 INFO L168 Benchmark]: TraceAbstraction took 1941.97 ms. Allocated memory is still 151.0 MB. Free memory was 103.0 MB in the beginning and 55.9 MB in the end (delta: 47.2 MB). Peak memory consumption was 46.9 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,761 INFO L168 Benchmark]: Witness Printer took 60.60 ms. Allocated memory is still 151.0 MB. Free memory was 55.9 MB in the beginning and 53.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:22,766 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory was 123.6 MB in the beginning and 123.5 MB in the end (delta: 84.5 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 302.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.4 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 34.68 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 116.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.17 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 408.32 ms. Allocated memory is still 151.0 MB. Free memory was 115.0 MB in the beginning and 103.5 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1941.97 ms. Allocated memory is still 151.0 MB. Free memory was 103.0 MB in the beginning and 55.9 MB in the end (delta: 47.2 MB). Peak memory consumption was 46.9 MB. Max. memory is 8.0 GB. * Witness Printer took 60.60 ms. Allocated memory is still 151.0 MB. Free memory was 55.9 MB in the beginning and 53.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] int input = __VERIFIER_nondet_int(); [L15] CALL, EXPR id(input) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=1, id((unsigned int)x-1)=0, x=1] [L8] int ret = id((unsigned int)x-1) + 1; [L9] COND FALSE !(ret > 3) [L10] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L8] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=2, id((unsigned int)x-1)=1, x=2] [L8] int ret = id((unsigned int)x-1) + 1; [L9] COND FALSE !(ret > 3) [L10] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L15] RET, EXPR id(input) [L15] int result = id(input); [L16] COND TRUE result == 2 [L17] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 65 SDtfs, 7 SDslu, 208 SDs, 0 SdLazy, 60 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 109 NumberOfCodeBlocks, 109 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 80 ConstructedInterpolants, 0 QuantifiedInterpolants, 2274 SizeOfPredicates, 1 NumberOfNonLiveVariables, 72 ConjunctsInSsa, 7 ConjunctsInUnsatCore, 5 InterpolantComputations, 3 PerfectInterpolantSequences, 23/27 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...